Mobile communications terminal with position determination

• US 7,355,995 B2
• Filed: 07/15/2002
• Issued: 04/08/2008
• Est. Priority Date: 07/31/2001
• Status: Expired due to Fees

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: Takeuchi, Toshihiro, Ogino, Hiroyasu, Shamoto, Michio, Hayashida, Atsushi, Shintai, Tatsuya, Oda, Kyoji
• Primary Examiner(s): Ryman; Daniel J.
• Assistant Examiner(s): HAN, CLEMENCE S
• Application Number:
  US10/193,898
• Publication Number:
  US 20030026225A1
• Time in Patent Office: 2,094 Days
• Field of Search: None
• US Class Current: 370/328
• CPC Class Codes: H04B 7/18547 for geolocalisation of a station position fixing by direction or distance determination G01S5/00

Abstract

A mobile communications terminal has a transmitter for transmitting a specific identification code of a reference base station as a time reference for network position determination. Therefore, a position server connected with a CDMA network can distinguish the reference base station from the other base stations regardless of positioning relationship between the mobile terminal and the base stations.

Claims

1. A mobile communications terminal for communicating with base stations forming a CDMA communications network and acquiring base station information from the base stations so that a network position thereof is determined by a network server based on the base station information, comprising:

a reference determination portion for determining a reference base station as a time reference for network position determination purposes from a neighbor base station with respect to the mobile communications terminal based on PN offsets assigned to respective base stations;

an identification code acquisition portion for acquiring an identification code of the determined reference base station; and

a transmitter for transmitting the identification code of the determined reference base station to a position server via the network,

wherein the identification code acquisition portion receives overhead information of the determined reference base station to acquire the identification code of the determined reference base station during an idle mode, and disconnects communication of the mobile communications terminal and places the mobile communications terminal in an idle mode if the mobile communications terminal is connection mode, and then receives the overhead information during the idle mode.